Carpenter&#39;s bit.



W. B. KNAPP.

GARPENTEES BIT.

APPLICATION FILED 001'. 7, 1909.

' 1,015,446. Patented Jan.23, 1912.

WITNESSES INVENTOR,

7 ATTORNEYJ pose indicated above,

'WILLIAM B. KNAPIP, OF PATEBSON, NEW JERSEY.

CARPENTERS BIT.

Specificationof Letters Patent. Patented Jan. 23, 1912.

Application fi led October "7, '1909. Serial No. 521,512.

To all whom it may concern:

Be it known that I, WILLIAM B. KNAPP, a citizen of the United States, residing in Paterson, Passaic county, invented a certain new and useful Improvement in Carpenters Bits; and I do hereby declare the. following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same, ref-.

erence being had to the accompanying drawthereon, tion.

The object of this invention is to provlde which form a part of this specificaf means whereby circular grooves or other circular cuts may be effected where it is not convenient or possible to accomplish the same work in a lathe or the like.

In producing a device useful for the pur I have had in mind to make it adapted for producing cuts varying in diameter, as also for quick exchange 'of cutters where a cut of different form from one previously made is desired.

According to my stock or holder having a suitable point or centering device, and In said stock, adjustable radially therein, a cutter is set whose working portion projects substantially parallel with the axis of the stock; I also preferably provide the stock with an adjustable stop which, by coming in contact with the work, is adapted to limit the action of the tool and hence determine the depth of the out. In my effort to produce a practical device of the character thus generally outlined, I have found that for certain classes.

of work it is necessary that the cutter have its cutting end peculiarly formed, and this not only to re uce the cost of manufacture, but that the cut produced be clean and true and that the device as a whole may be manipulated with facility and with as little torsion and vibration as possible; to this end the cutter has been provided with a cutting end designed to cleave into the work in a more or less upright plane.

In the accompanying drawing, Figure 1 is a front elevati n of the improved tool; Fig. 2 a side elevation; Fig. 3 an underneath plan; Fig. 4 a rear elevation of the cutter; Fig. 5 a front and side elevation of another form of the cutter; Fig. 6 a rear elevation of still another form of the cutter; Fig. 7 shows New Jersey, havev lugs, and to letters of reference marked invention, I provide a I order to be able to of the cutter close to the centering device 0,

the preferred form of the centering device; and, Fig. 8- is a plan view of a piece of material operated upon by the improved tool. a

a designates the stock, the same having an upwardly be fitted to a brace or the like. In the axial line of the stock there is arranged at its lower end a centering device a, whichmay be either in the form of a plain tapering pin, or in the form of a screw, as at d in Fig. 7 The centering device may be screwed into or otherwise secured in the stock; if screwed therein, its thread is reverse with respect to the direction in-which the tool is intended to be turned.

A transverse hole e is-formed in the stock, the same being preferably non-circular in cross-section. In this hole is fitted the straight elongated shank f of the cutter g,

projecting shank 6 adapted to turned off downwardly with. respect to its shank so as to stand substantially parallel with the axis of the stock. The cutter is rendered adjustable radially of the stock :(that is, in the direction of the length of the shank of the cutter) by virtue of a setscrew it tapped into the stock and adapted tobind against the shank of the cutter. In bring the working end said end may be bent first inwardly, as at z, and then downwardly, as at y into close proximity to the centering device (see dotted lines in Fig. 1 and see also Fig. 4:).

The stock has a vertically fiat face is preferably parallel with the shank of the cutter g, and against this face is secured the flat shank Z ofa stop m whose free end a is bent ofi' horizontally and has a hole 0 receiving the centering device 0 The shank Z of the stop is formed with a vertical slop p through which is passeda screw-q whichis tapped into the stock and is adapted for securing the stop at any desired elevation. When the tool is used to out a groove, the stop ultiniately impinges against the work and lim its the downward movement of the tool; any desired depth of groove may thus be formed by simply adjusting the stop verticall Siiveral forms of cutters which may be used are shown in the accompanying drawmg, the same being designed to cut different shapes of grooves. For instance,that shown in Figs. 1, 2, 3 and 4 serves to cut a cross-sectionally square groove; that shown in gins of the groove,

Fig. 5'is designed to cut a V-shaped groove; and that shown in. Fig. 6 cuts a groove having a convex rib. In Figs. 1 'to 4, the cutterhas two vertical downwardly depending ears or edges 1- '1" which form the mare and in advance ofsaid edges a relatively or chisel 8. When the cutter engages the work, the edges 1' r first cut the marginal portions of the groove and on the next rotation the chisel s removes the material between the cuts producedby the edges r 'r'. InF-ig. 6, the cutting ears or edges t t and cutting edge or chisel u are the same as the cutting edges r 'r and s, respectively, of the cutter shown in Figs. 1 to 4, except that the edge u is concave; this cutter operates the same as the cutter shown in Figs. 1 to 4. In

, Fig; 5, the cutter is tapered to a fiat point,

as ato, and upwardly from said point it has; the diverging grooves w producing at the outer side of each groove the cutting edge w; in the preliminary rotation of the :tool, the edge v forms a single out, which is gradually widened by the tapering portion of the cutter immediately above the edge o until finally the edges 01; come into play and cut away the sides ofthe V-shaped grooves being produced.

It will be understood-that I am not limited to any particular form of cutter, as various-kinds of cutters may be used according to the style of out which is to beproduced. It is essential, however, in order that thetool may be used with the greatest efiiciency incutting various kinds of material,\that-the cutterbe provided with a cutting edge or edges arranged substantially vertically and adapted to efiect a cut preliminary to that. performed in giving the ultimate shape to .the groove or other out being made; u Fig. 8 shows hgw a block of wood, for instance, may be operated upon by my .tool

horizontal cutting edge I the stop -centering device arranged in one so as to produce circular grooves or cuts 3 of any desired diameter.

The end ofthe stock is shown rounded or part-cylindrical in Fig. 2. The purpose of this is to prevent damage, either by splitting or otherwise, to the wooden block or piece being cut; that is to say, in some cases Z not being used and being detached, if the end of the stock were fiat its broad contact with the block, indicating that the out had been completed, would be calculated to do the damage indicated before the rotation of the stock could be stopped, as when the latter is fitted in a lathe, for instance.- Under the same circumstances, the end of the stock being rounded in the way indicated, it can, in effect, sink itselfto a limited extent into the wood without doing greater damage.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is The combination of a rotatable stock, a

end thereof, a tool having a shank-portion and a cuttingortion projecting angularly from the slum -portion, said tool being arranged in the stock with its shank-portion disposed at a right angle to the axis of rotation of the stock and havin the end part thereof comprising its cuttmgortion bent first downwardly, then inwar 1y toward the axis of the stock in a line crossing said axis at right angles and below said end of the stock and then downwardly, substantially as described. I

In testimony, that I claim the foregoing I have hereunto set my hand this 6th day oi October, 1909.

, WM. B. KNAPP.

Witnesses: V J OHN W. \STEWARD, WM. B. Bram. 

